Hey, thanks for the detailed report. This is a known issue. Deleted chats and agent sessions can come back because of a bug in local state management, not server sync like you guessed. It’s a client-side issue.
The team is aware, the fix is already done, and it should land in the next stable release.
Main thread is here: Deleted past chats will appear again after the new recent update
There’s no workaround right now. Manually clearing caches, like you already tried, doesn’t help because stale state overwrites the tombstones on startup. We’ll need to wait for the next update.